Powering Arduino with Lipo+Mt3608

Using Arduino Project Guidance
#1

Hi everyone,
I had a question regarding my Arduino project. I want to power an Arduino Pro Mini to make it portable, and I have these components with me at the moment:
-Arduino Pro Mini
-1700 MaH LiPo battery
-TP4056
-MT3608 Boost Converter
I was wondering if it would be safe (for me and the Arduino) if I connected the battery to the charger board to charge it, which then gets connected to a boost converter so I can power it. I am planning to add slide switches in between several components for safety, so that nothing gets damaged.

I am new to electronics, so pardon me if anything I saw now is stupid. The battery I have is a 3.7V Lipo battery, and the manufacturer says that it can supply 850Ma. I know that my project will not draw over 200 MaH (as I believe that is the maximum the Arduino can provide). If the battery can provide 850 milliamps, will that destroy my board? Furthermore, would it be safe to connect the output of the converter set a 5V to the 5V pin of the Arduino, and still connect modules to the pin? I just got my converter, and while testing it with a small battery I had, I found that the converter was set a 5V, would would fluctuate by a hundredth of a volt (at one second, it would be 5.01, then 5.02, then 4.99, then 5 etc.) Would this damage my board?

#2

You are on the right track. Lipo -> boost -> arduino and other devices. You definitely want to connect the arduino through the +5V pin, not Vin. Vin leads to the on-board voltage regulator which needs at least 6V to operate and since you already have 5V from your booster, just use that. Connect all your other devices to the same pin.

As for a 0.01V variation, that is nothing. If you took the time to measure many of your 5V phone chargers, you would see much more variation than that. Anything within 10% is normal (4.5V to 5.5V)

1 Like
#3

Do some research about terminology. "M" is the symbol for Mega, "m" for milli. aH stands for ampere hours. MaH I don't believe in....
"If the battery can provide 850 milliamps....". If You have been using the correct terminology that would tell that the maximum current draw from the battory is 850 milli Amperes.
A voltage converter always have some ripple. +/- 0.01 volt is a very good value.

Please make a drawing, pen and paper, and show the intended wiring.

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#4

Errr,
Ah stands for ampere hours, don't know what a stands for, H stands for Henry.

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#5

I think aH is is on the periodic table of elements. It is the element of surprise :grin:

2 Likes
#6

Haha, disharmony with the shift key on the keyboard... Ah is the correct designation.
MaH might be MagnesiumHydrid....

1 Like
#7

Didn't find any aH there, only Ag Silver, Au Gold, As Arsenik.....

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#8

Your humor detector seems to be broken. You might want to get it checked.

1 Like
#9

Haha. Looks like we need it both.....
I guess the writing by OP could have been a distraction...
Fast and faulty it was this time.

1 Like
#10

Guys and girls,
Back to the topic please.
Thanks,

1 Like
#11

Ok, thank you for your help!